| 摘要 |
Oxidation colorants which contain at least one secondary intermediate and at least one derivative of 5,6-dihydroxyindoline corresponding to formula (I): in which-independently of one another-R1 is hydrogen, a C1-4 alkyl group or a C1-4 hydroxyalkyl group, R2 is hydrogen or a -COOH group which may even be present as a salt with a physiologically compatible cation, R3 is hydrogen or a C1-4 alkyl group, R4 is hydrogen, a C1-4 alkyl group or a group -CO-R6 where R6 is a C1-4 alkyl group and R5 is one of the groups mentioned for R4, or a physiologically compatible salt of these compounds with an organic or inorganic acid in an aqueous carrier and which are free from oxidation dye precursors of the primary intermediate type enable hair to be colored in particular in black tones with no tinges of red. In particular, completely or partly grey hair can be colored in tones which come very close to the color of the hair before greying. |
